Grokking the Coding Interview: Patterns for Coding Questions

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Solution: Path With Given Sequence

Problem Statement

Given a binary tree and a number sequence, find if the sequence is present as a root-to-leaf path in the given tree.

Constraints:

1 <= arr.length <= 5000
0 <= arr[i] <= 9
Each node's value is between [0 - 9].

Solution

This problem follows the Binary Tree Path Sum pattern. We can follow the same DFS approach and additionally, track the element of the given sequence that we should match with the current node. Also, we can return false as soon as we find a mismatch between the sequence and the node value.

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